Introduce TaskRunner::RunsTasksInCurrentSequence()

third_party/WebKit/Source/platform/WebTaskRunner.h

Index: third_party/WebKit/Source/platform/WebTaskRunner.h
diff --git a/third_party/WebKit/Source/platform/WebTaskRunner.h b/third_party/WebKit/Source/platform/WebTaskRunner.h
index 0a79fecd3bd257cd6d1a46b07c4038b566ebb598..c5c19f8c9943bf1be027f7182d6a2c8b2cbe0373 100644
--- a/third_party/WebKit/Source/platform/WebTaskRunner.h
+++ b/third_party/WebKit/Source/platform/WebTaskRunner.h
@@ -65,9 +65,13 @@ class BLINK_PLATFORM_EXPORT WebTaskRunner
                                base::OnceClosure,
                                double delay_ms) = 0;
 
-  // Returns true if the current thread is a thread on which a task may be run.
-  // Can be called from any thread.
-  virtual bool RunsTasksOnCurrentThread() = 0;
+  // Drepecated: favor RunsTasksInCurrentSequence().
+  // TODO(http://crbug.com/665062): mass redirect callers and remove this.
+  bool RunsTasksOnCurrentThread();
+
+  // Returns true if tasks posted to this TaskRunner are sequenced
+  // with this call.
+  virtual bool RunsTasksInCurrentSequence() = 0;
 
   // ---